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author | Matthew Heon <matthew.heon@pm.me> | 2022-09-16 15:00:37 -0400 |
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committer | Matthew Heon <mheon@redhat.com> | 2022-09-22 13:07:40 -0400 |
commit | fc6dcd12b3430f2d1ee495ef19d184a088f3bb34 (patch) | |
tree | 0037ce64d14f971fec5cd29e16a63e7a0f331dc1 /libpod/define | |
parent | 08993516a939576fa009db6e7ed32524026a822d (diff) | |
download | podman-fc6dcd12b3430f2d1ee495ef19d184a088f3bb34.tar.gz podman-fc6dcd12b3430f2d1ee495ef19d184a088f3bb34.tar.bz2 podman-fc6dcd12b3430f2d1ee495ef19d184a088f3bb34.zip |
Add support for 'image' volume driver
We added the concept of image volumes in 2.2.0, to support
inspecting an image from within a container. However, this is a
strictly read-only mount, with no modification allowed.
By contrast, the new `image` volume driver creates a c/storage
container as its underlying storage, so we have a read/write
layer. This, in and of itself, is not especially interesting, but
what it will enable in the future is. If we add a new command to
allow these image volumes to be committed, we can now distribute
volumes - and changes to them - via a standard OCI image registry
(which is rather new and quite exciting).
Future work in this area:
- Add support for `podman volume push` (commit volume changes and
push resulting image to OCI registry).
- Add support for `podman volume pull` (currently, we require
that the image a volume is created from be already pulled; it
would be simpler if we had a dedicated command that did the
pull and made a volume from it)
- Add support for scratch images (make an empty image on demand
to use as the base of the volume)
- Add UOR support to `podman volume push` and
`podman volume pull` to enable both with non-image volume
drivers
Signed-off-by: Matthew Heon <matthew.heon@pm.me>
Diffstat (limited to 'libpod/define')
-rw-r--r-- | libpod/define/config.go | 4 | ||||
-rw-r--r-- | libpod/define/volume_inspect.go | 3 |
2 files changed, 7 insertions, 0 deletions
diff --git a/libpod/define/config.go b/libpod/define/config.go index 1fad5cc9a..0427206ed 100644 --- a/libpod/define/config.go +++ b/libpod/define/config.go @@ -40,6 +40,10 @@ type InfoData struct { // itself. const VolumeDriverLocal = "local" +// VolumeDriverImage is the "image" volume driver. It is managed by Libpod and +// uses volumes backed by an image. +const VolumeDriverImage = "image" + const ( OCIManifestDir = "oci-dir" OCIArchive = "oci-archive" diff --git a/libpod/define/volume_inspect.go b/libpod/define/volume_inspect.go index 76120647c..4d6f12080 100644 --- a/libpod/define/volume_inspect.go +++ b/libpod/define/volume_inspect.go @@ -58,6 +58,9 @@ type InspectVolumeData struct { NeedsChown bool `json:"NeedsChown,omitempty"` // Timeout is the specified driver timeout if given Timeout uint `json:"Timeout,omitempty"` + // StorageID is the ID of the container backing the volume in c/storage. + // Only used with Image Volumes. + StorageID string `json:"StorageID,omitempty"` } type VolumeReload struct { |